Accurate Exhaust

Has anyone tried these Early A Exhaust from Accurate?
Does Anyone know the difference between the Performance and Hi-Po choices?
Here's a Link to what I'm looking at... A Body Y-Pipe with Intermediate Pipe (Set)-Y-Pipes

Also considering Waldrons? 1965-67 Plymouth Barracuda V8 273ci 4 BBL Carburetor Single Exhaust w/Resonator Eliminator Pipe
Looking to scrap the Home-made Dual Exhaust and replace with a Commando Style.
Which Way should I go?

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I bought an accurate kit for my sons 72 dart and it fit very well. I thought it was way better than going to an exhaust shop. At the time I went to Roseburg to see his facility. Everything is built on a jig and he has the chassis sitting there in the yard for his R&D. good company.